logo

Video encyclopedia

Ultrasound

2:23

Ultrasound - Official Trailer

3:05

Joyner Lucas - Ultrasound (508)-507-2209

2:37

What is an ultrasound?

1:41

How Ultrasound Works

2:57

Ultrasound : Johnny Massacre : animated music video : MrWeebl

Ultrasound is sound waves with frequencies higher than the upper audible limit of human hearing. Ultrasound is not different from "normal" (audible) sound in its physical properties, except in that humans cannot hear it. This limit varies from person to person and is approximately 20 kilohertz in healthy young adults. Ultrasound devices operate with frequencies from 20 kHz up to several gigahertz.